You've got Novalis, Ursula and Nidhogg, which is a good core to any Dragon team, but without Azathoth you'll likely be struggling a good bit.
- If you insist on going with pure Dragons, you could try leading with Ursula and allying Azathoth.
- If you've got PR Artemis you might lead with her and use the core Dragon members, since Novalis takes all your off-color Dragons and the high combo count can make up for lower REC.
- PR Nidhogg + PR Barbara is possible, but the team is rather weak in the meta right now and forces you to also include Earth Beasts.

My advice would be to leave the Dragons behind and focus on your other cards, starting with the better leaders.